Dado-machine.



J. H. DUBRULE.

DAD() MACHINE.

APPLwATxoN FILED SEPT. 22, 1913.

Patented May 1,2, 1914.

2 SHEETS-SHBET 1l @In vente@ J. H. DUBRULE.

DADO MACHINE. APPLICATION FILED SEPT. 22, 1013.

1,096,611 PatentdMay 12, 1914.

2 SHEETS-SHBBT 2.

\ nwntoz W Y //l Qvitmmoeo $00651@ 3E;

3M ufl/ .f f` Vw WZMQ JOSEIE'H Hf DUBRULE, OF EAST HARTFORD, CONNECTICUT.

DADO-MACHINE.

Specification of Letters Patent.

Patented M a3' 12, 11.9141.

Application led September 22, 1913. Seria] No. 796,194.

To all 107mm, it may concern Be it known that I, Joenrn H. DUBRULE, a citizen of the United States, residin at East I-lartford, in the county ofI-Iart ord and State of Connecticut, have invented 'certain new and useful Improvements in Dado- Machines; and I do declare the following to be a full, clear, and exact description of the invention, such'as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to woodworking, and more especially to gaining or routing; and the object of the same` is to produce a machine which will cut a groove across a 'piece or' work which may be sligntly arched or (lished, but the groove Will be of the same depth and cross section throughout its length. This and other objects are accomplished by constructing the machine in the manner hereinafter' more fully described and claimed, and as shown in the drawings wherein' Figure 1 is a side elevation of the machine complete, and Fig. 2 is a section on the line Q--Q'of Fig. 1; Fig. 3 is a plan view Fig. It is an enlarged side `elevation of the lower portion of the. machine, and Figs. 5 and 6 are sections on the lines .Vg-5 and 6-6 respectively of Fig. 3, showing the parts in slightly different position. Fig. 7 is a cross section on the line 7-7 of Fig. 3; Fig. S is au. enlarged sectional detail of the forward end of the runner, and Fig. 9 is a transverse section on the line9 9 of Fig. 8; Fig. 10 Ais a detail perspective View of thc forward end of the runner.

Mounted in .overhead hangers 1 is a shaft carrying `fasty and loose pulleys 3 and el by means of which it may be connected with a source of power, and between the hangers the shaft carries a drive pulley 5. Pivo-tally mounted on the shaft 2 is a swiuging frame 6 having bearings atits lower end in whichis journaled a driven shaft 7 carryingr a pulley 8 which is belted as at 9 to the drive mile r 5 and one end of this shaft carl1 to a pulley 12 on the-shaft or arbor 13 that` ci 'ries the'tool T. In the present case riesanother pulley 1Q which is belted as at S, but I do not irish lo bc limited to tlnA tool employed as ot' course it will he changed when the groove (l to bc wider or narn rower or ot' different shape.

In order to permit the tool to lic changed. 'mechanism is provided aswill be explained below. L-shaped brackets 11 have their ieet V15 adjustably mounted on the side laars or arms of the swinging tramo (l hy meantt of set screws 16 or otherwise, while the pendent arms 17 of these brackets have eyes 1S at their lower vends in which is removably mounted a rod 19 held in place. by means of set screws 20, and on the ends of this rod mounted what might be called the head of thc machine which is an H-shapcd structure 21 having bearings or eyes Q2 loosely embracing said rod as best seen in Fig.. 3 and a single bearing 23 at the forward end of one of itsarms in which is journaled one end of the arbor 13. The other arm 24 is removably connected with the body of the head byrneans of set screws 25, and this arm has another bearing Q6 through which vthe arbor 1B passes; and the obvious function of this detail of construction is to permit the removal of the arm 24 so that the arbor can be withdrawn and replaced by another, or,`tvhen the arbor is out'of position, the tool 1 can i be replaced by another in a manner Well understood by those familiar with this art. 1t will be noted from Fig. 5 that the rod'19 stands normally forward ofthe driven or counter shaft 7, so that an adjustment of the brackets 14 'up and down on 'the side bars 'of the swinging t' 'amc G does not destroy the tension on the beltll connecting this countor shaft with the arbor 13 and yet when it is necessary to replace the tool l with one of considerable size it is possible to replace the bolt 11 by another which will have the proper tension although the entire h ad be mounted higher up on the swinging frame 6. The obvious purpose is to have rotary movement communicated from the power shaft 5 to the arbor 13 and the tool T, so that when the latter is moved over thc stock S the groove G will be cut in thc same `and the.

shape and size of this groove will correspond with. the cutting face of the tool yand the `depth 'to Whichit 'is permitted to out. A.

guard 2"?y preferably "overlies tno tool to keep sawdust out of the tace rif-.the operator who les stands in fro-nt of the machine which would be to the right of it illustrated in Figs. 1, 3, a, 5, and 6.

Other details well known in the art may be applied withoutdeparting from theprineiple of my invention, such as belt tighteners, oil cups, and the various adjustments and reiinements with u hich these machines are supplied.

The principal feature of my invention may be said to lie in the gage for regulatingr the depth to which the groove shall be cut in the stock, so that no matter if said stock is arched or dished the groove will be of the same depth from its upper face. Broadly speaking this gage consists of a pair of runners whose rear ends are hingedly or pivotally supported beneath the head and whose forward ends curve. downward and carry adjustable shoes, means whereby the operator may adjust the position of said runners as he desires the depth of the groove increased,

. and means whereby the shoes themselves may be adjusted to a different are if the stock S 2s. have considerable width as will be explained his below. In vthe preferred embodiment of my invention, each runner 30 has a slot 31 at its rear end loosely mounted on a cross rod 52 carried by and beneath the head, while the forward end of the runner has a stud 33 movable in an upright slot in a guide 3st depending` from the head beneath the arbor Journaled in bearings beneath the head is a rock shaft 35 having arms 36 at its eX- tremities projecting forward and slotted as at 87 `to loosely engage studs 38 on the inner side of the runners, and it follows' that when this rock, shaft 35 is turned the front ends of the runners will be raised or' lowered, their forward studs 33 rising and falling in the slotted guides 34: while their slotted rear .ends 31 move slightly over the cross rod 32.A

`While any suitable means may be provided for manually rocking; the shaft 35 as the necessities of the case may demand, I preferably make use of the following mechanism: Mounted in bearings 40 upstanding from the forward end of one of the arms of the H- shaped head 21 and preferably above its' fixed bearing" 23. is an oscillating handle 4:1 from whose shaft an arm 42 projects forward, and the front end of tliis arm is connected by a link 43 with the forward end of a lever dt whose' body is bent best seen in 6 so as to pass under the arbor 13. is pivoted at i5 to the head 21, and pivotally connected at its rear end at 46 with a link 17 which leads downward and connects with one of the arms 3G on the rock shaft .35. The construction is such that when the handle lll is turned in one directionthe runners are raised, and when it is turned in the other direction they are depressed, and the direction by preference such as is convenient to the hand of an operator standingin front of the machine as Will be explained below.

One other detail of construction follows from the fact that if the stock S is quite wide andv the movement of the tool T across it causes the head 21 to travel through a considerable are with reference to the swinging frame 6, at either extreme of its movement `when the head is supported by the runners near the forward or 'rearward ends of the curved portion of the latter, their distance from the axis of the arbor 13 may not be ever the same. In order, therefore .to provide means for' adjusting the curvature of the rounded or forward portions of the runners, I make use of a steel shoe 50 secured at itsI rear end to the point 51 beneath each runner and having' its body bent downward under the curved portion of said runner and carried forward and upward best seen in Figs.v ai. and 6, and the front end of this shoe is rendered adjustable by the detailed construction best seen in Figs. S, 9, and 10. That is to say, the front end of the shoe is forked or bifurcated and provided with a pair of knuckles or eyes 52, and between these is pivoted on a pin 53 the lower end of a link 54 which has a longitudinal slot in its body. Each link passes upward through a slot or openingr 5G in the toe of the runner 30 and is rendered adjustable therein by means -of a set screw 5T as best seen in Fig. 9. W'hen the twoset screws 57 are loosened it is obvious that the links may he adjusted upward and downward within the openings 56, and such adjustment causes a corresponding movement of both 'of the. shoes so that the curvature thereof may be adjusted to suit the occasion. If a lgreater degree of adjustment is desired than permitted b v this construction, it is quite possible to entirely remove the runners and replace them byothers whose lower faces are curved to a greater or lesser degree and also preferably carry the shoes as dcseribed. This removal is effected by disconnecting Athe hand-operating mechanism, knocking out the cross rod 32, and replacing the runners and restoring` said rod in a. manner which will be clear. `In order to limit the rise of the runners (which would permit the descent of the cuttingv ytool T), no matter how the operating handle 41 may be turned in ail-effort to raise them, I prefer ably' provide the head with a pair of set screws V60 which pass downward through its arms with its lower extremities disposed above the runners as perhaps best seen in. Figrt, and these set screws could be adjusted so that under no circumstances may the runners rise so high relativelyrto the head that the tool will out too deep a groove inthe stock. The parts are of the desired sizes, shapes, proportions, and materials. and changes in details may'be made without operator now has' his left hand free to hold a manner already described.

the stocka'gainst al suitable stop roughly indicated in Fig. G in the shape of a plug P, and' the entire head of the tool is moved forward and backward' over-the stock by pulling and pushing on said handle, while the cutting :face of the tool is permitted to descend and act on the upper face of the stock by the rotary adjustment of said handle in To be more specific, the natural tendency of the work- -man as he pushes the tool to the rear is to rotate the handle l1 in the direction of the arrow shown in Fig` 6, and through the con nections between this handle and' the runners it will be seen that the latter are depressed by such rotation of the handle so .that he may slide the shoes 50 over the upper 'face 'of the stock (on which they of course rest at either side of the groove G) without theteeth of the tool touching the stock at all. When he has pushed the tool to .the rear, a reverse movement oli' the handle raises the runners and permits the tool T to descend, and the groove G is cut. This may be accomplished by one movement of the tool across the stock or repeated movements if desired, and l do not wish to be limited in this respect. Woreover` I'have shown A the teeth of the tool as disposed in a certain direction, but I do not wish to be limited in that respect nor in other details urther than as set forth in the claims below. Having finished this piece of wor-k, the tool maybe pushed to the rear beyond the stock and a new piece put in place. It the groove in that piece is to be diflerei'it. the arm 24 will be detached from the head 2l and the arbor 12:3 with itstool withdrawn from place, a new tool' mountedthereon, and the parts replaced in a manner well known to those skilled in this art.

@What is claimed as new is:

jl. The combination with an overhead drive shaft having a pulley. a swiuginw frame hung on said shaft, a counter shalt j'onrnaled through the lower end of said frame and having aI pulley, and a belt connecting said pulleys; of ahead, a tool-arbor journaled therein and havingr a. pulley, a see` oud pulley on. the counter shaft, u. belt oon- "i meeting it 'with that on seid arbor,*a rod across the head. forward of said counter shaft, L-shaped brackets having oyes mount ed; on said rod and feet embracing the side arms of said swinging frame, and means for permitting the attachment of the feet to said arms in various positions.

2'. The combination with an overhead drive sha-ft having' u.- pulley, a swinging frame hung on said shaft, a counter shaft rjournaledl through the lower end of said frame and having a pulley, and a belt connecting said' pulleys; of a head', a tool-arbor journal'ed therein, connections between said counter-shaiit and arbor, said' houd being oit' Hehaped' construction with eyes in itsl rearmo'st arms, a cross'rod mounted in said eyes, a pair of L-shaped brackets having eyes at their forward' ends mounted' on said rod and a pair of feet at their rearward* ends mounted astride the upright arms of said frame, and set screws through said feet against said' arms.

3. The combination with a swinging frame mounted in overhead: hangers, a substantial'ly horizontal head, a tool whose arbor is journaled inthe head, and connections between said arbor' and an overhead source of power; of brackets at the rear end of said head adjustable vertically on said frame,

ya runner having a curved lower face below the head? and opposite said tool', means for adjusting the position of said runner, a shoe beneath said face, and means for adjusting the curvature of the shoe.

4. The combination with a swinging :frame mounted in overhead hangers, a substantially horizontal head', a tool whose arbor is journaled in the head, and connections between said arbor and a source of power; of

'means for supporting the rear end of thejhead from said frame, a runner pivotally tconnected at its rear end with the head and lstanding below the isame alongside the tool,

a shoe carried by the lower face of said runner, and means :for adjusting the curvature of said' shoe.

.5. The combination with a swinging iframe, a substantially horizontal head car ried thereby, a tool whose arbor is journaled in the head, and means for driving said arbor from a source oi power; of a pair ot lrunners hingedly connected at their rearends with said head and standing below the same, their forward ends standing en opposite sides of said tool and being curved on I their lower faces, manually controlled mechanism for swinging said runners around their lunges, a curved shoe beneath the' icurved portion of each runner, and means lier ad3ustmg the curvature of said shoe.

6. The combination with a substantially H-shaped head, means for supporting' its rear end, adjustable means for supporting its rear end at different heights, a -tool whose arbor isI journaled through the forward arms of said head, and means for rotating said arbor; of a pair of runners hingedly oon- Vnected at their rear erds with said head and standing below the saint. their forward ends standing on opposite sides of said tool and being curved on their lower faces, manually controlled mechanism for-swinging said runners around their hinges, a .curved shoe beneath the curved portion of each runner, and means for adjusting the curvature of said shoe.

y7. The combination with a substantially H-shaped head, adjustable means for supporting its rear end, a tool whose arbor is journaled through the forward arms of said head, and means for rotating said arbor; of a runner connected with the head and standing below the same alongside the tool, a shoe carried by the lower face of said runner, and means for adjusting the curvature of said shoe.

8. The combination with a substantially H-shaped head, means for supporting its rear end, a tool whose arbor is journaled through the forward arms of said head, and means for rotating said arbor; of a pair of slotted guides depending from the forward arms of said head, a cross rod beneath the head, a pair of runners having their rear ends slotted and mounted on said rod and their forward ends curved downward, studs in said forward ends loosely engaging the slots in said guides, and means "for raising and lowering said forward ends.

9. The combination with asubstantially H-shaped head, means for supporting its rear end, a tool whose arbor is journaled through the forward arms of said head, and means for rotating said arbor; of a pair of slotted guides depending from the forward arms of said head, a cross rod beneath the head, a pair of runners having their rear ends slotted and mounted on said rod and their forward ends curved downward, studs in said forward ends loosely engaging the slots in said guides, an oscillating handle mounted on said head, a rock shaft having slotted arms projecting from it, studs in said shoes loosely engaging these slots, and connections between said rock shaft and handle.

10. The combination with a substantially H-shaped head, means for supporting its rear end, and a tool whose arbor is jour `naled through the forward arms of said head; of a pair of slotted guides depending from the forward arms of said head, a pair of runners having theirrear ends hingedly supported by the head and their forward ends curved downward, studs in said forward ends-loosely engaging the slots in said.

guides, an oscillating handle vmounted on sa'id head, a rock shaft having slotted arms projecting froml it, studs in said shoes loosely an arm projecting from the shaft of saidk handle, a lever pivoted between its ends within said head and A having its forward portion passing under the arbor, a link connecting its front end with said arm on the handle, and a link connecting its rear end with one of the arms on said rock shaft.

ll. In a machine of the class described, the combination with a substantially horizontal head having forwardly projecting arms, means for supporting its rear end and permitting the head to move forward and backward, a cross rod beneath the head, and a tool whose arbor is journaled through said arms; of a pair of slotted guides depending from said arms, a pair of runners having their rear ends slotted and mounted on said rod and their forward ends curved downward, studs in the runners loosely engaging the slots-in said guides, shoes beneath said forward ends, and means for raising and lowering said forward ends.

' 12. ln a machine of the class described, the combination with a substantially horizontal head having forwardly projecting arms, means for supporting its rear end and permitting the head to move forward' and backward, and a tool ywhose arbor is journaled through said arms; of a pair of slotted guides depending' from said'head, a cross rod beneath the head, a pair of runners having their ends slotted and mounted on said rod and their other ends curved downward, studs in said curved ends loosely engaging the slots in said guides, an oscillating handle mounted on said head, a rock shaft having slotted arms projecting from it, studs in said. shoes loosely engaging these slots, and

'connections between` said rock shaft and handle.

13. In aanachine of the class described, the combination with a substantially horizontal head having forwardly projecting arms, meansfor supporting the rear end of the head and, permitting the head to move forward and backward, a tool whoseA arbor is journaled through said arms, and means for rotating saidgfarbor; of a pair of slotted guides depending from the forward arms of said head, a cross rod beneath the head, a pair of runners having their rear ends slotted and mountedon said rod and their forward ends curved downward, studs in said forward ends loosely engaging the slots in Vsaid guides, shoes beneath said forward ends, an oscillating handle mounted on said head, a rock shaft having slotted arms projectingfmm it, studs in said shoes looselyl engaging these slots, an arm projecting from the shaft of said handle, a lever pivoted be 'twe'en'its ends within said head andlhaving its forward portion passing under the arbor,

a -link connecting. lits front end with said arm on the handle, and a link co eating the rear end of said lever with onexdff on'said rock shaft. v

ythe arms portion thereof,l

14. A depth gage for wnod Working ma allinea comprising n, runner m'laptvd to be hnged'ly Connected at one out! with :md to stu-ncl beneatll "the LOOLCMQyng hundA it opposite end being; Curvwl. downward on :n line opposite said tool, means for 'permitting the vertical ndjust'nmlt of thifs and, a 5h01@ secured at its; rem: und beneath said rmmcr :md with its bmdy underlying the cufved and means for adjusting; the i-)bsltun @ik it@ liront and 'with respect to the kmh@ @nd of the runner.

JA cepth gage for Wood Working mw chinas comprising a Tunnel? adapted to be hngedlyconnected at one and with and t0 stand beneath the 'bool-carrying head, its opposite end being curved downward on a, line opposlte sald too, means for adjusting this und .vawt-cax/N-y, :.1 shoe scoured at iw mm' @mi bencxih amd runner und with im im@ uw "m'lyng tlm curved portion Lherfw', Mw from @ufl of the shoe ,having u pail: mi nyu a link pvoted at, its lower und between Smidv oyes amd having n slotted body, the Humm: xuvjnfg am upen'lng through which said body imaxes, and :L transverse set screw in tim ru'nna'r lxiluwsmzting Suid opening nml mgugng than 510 in said link.

lu ufstlmony whereof I have: hereuntu :mb my hand in presence of two subscribing wit*- masses.

JSEXH. H. DURULE.

Witnesses JAMES E. Somum, J. A. Gmmsmum. 

